In a big way, we are witnessing our faith to others when we are out in the world. For example, at my work, I have some icons, at my desk and they know I'm Orthodox. And I fast. They see me cross myself before eating. But, I can't go preaching to them because people don't like to be preached at. If they are interested to ask a question, then they will be willing to approach me since they know what I'm all about. But, people have lost their faith. There's even one Greek woman, at my office, who pretty much expressed absolutely no interest in God. Imagine! So, even if they were baptised in the Orthodox faith, they don't care. That's the world we're living in now.
And people sense a more sober approach to Orthodox worship. Just looking at the icons gives the impression that this is not a faith that will be shaking tamborines around. Anybody can pass an Orthodox Church and see some kind of icon on the front. Even the RC Churches has an organ.
Personally, I am open about being Orthodox and my choices in everyday life sets me slightly apart from the rest and others notice that. (Not that I look bizarre or anything - actually I blend in). My heart is always open for anyone that would be sincerely curious about the Orthodox faith, or in many circumstances, the Christian faith in general - since even those who get married in Churches are just doing it for the ceremony.
So, in my mind, I am reaching out to others about the Faith, just by being me.